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From: metcalf@maile.ifa.hawaii.edu (Tom Metcalf)
Newsgroups: comp.lang.idl-pvwave
Subject: Re: Wave under OpenWindows
Summary: Structure Names
Message-ID: <12799@uhccux.uhcc.Hawaii.Edu>
Date: 2 May 91 20:38:27 GMT
References: <11238@ncar.ucar.edu>
Sender: news@uhccux.uhcc.Hawaii.Edu
Organization: Institute For Astronomy, Hawaii
Lines: 14

Is there a way in IDL to determine whether a given structure name has been
defined?  Every test I have tried results in the error "Structure type not
defined" when the structure does not exist (eg "print,size({SNAME})") which 
then terminates the program.  What I need is a test which can be used in a 
program which indicates whether the structure is defined but does not generate 
(or at least does not print) the "Structure Is Undefined" error.

BTW, by "structure name" I don't mean the name of a variable which contains a 
structure but the name used in the structure definition.

All suggestions would be greatly appreciated!

Tom Metcalf
metcalf@uhifa.ifa.hawaii.edu